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package org.nd4j.linalg.api.ops;
import org.apache.commons.math3.util.Pair;
import org.nd4j.linalg.api.complex.IComplexNumber;
/**An index accumulation is an operation that returns an index within
* a NDArray.
* Examples of IndexAccumulation operations include finding the index
* of the minimim value, index of the maximum value, index of the first
* element equal to value y, index of the maximum pair-wise difference
* between two NDArrays X and Y etc.
*
* Index accumulation is similar to {@link Accumulation} in that both are
* accumulation/reduction operations, however index accumulation returns
* an integer corresponding to an index, rather than a real (or complex)
* value.
*
* Index accumulation operations generally have 3 inputs:
* x -> the origin ndarray
* y -> the pairwise ndarray (frequently null/not applicable)
* n -> the number of times to accumulate
*
* Note that IndexAccumulation op implementations should be stateless
* (other than the final result and x/y/n arguments) and hence threadsafe,
* such that they may be parallelized using the update, combineSubResults
* and set/getFinalResults methods.
*/
public interface IndexAccumulation extends Op {
/**Do one accumulation update. Given the current accumulation value (for
* example, maximum value found so far in an 'index of maximum value'
* operation) and another value and its index (x/xIdx), update the
* accumulation index.
* If the accumulation value is required in addition to its index,
* use the Op.op(...) methods.
* @param accum The value at the accumulation index
* @param accumIdx The accumulation index
* @param x A value to be processed/accumulated
* @param xIdx The index of the value to be processed/accumulated
* @return The new accumulation index
*/
int update(double accum, int accumIdx, double x, int xIdx);
/**@see #update(double, int, double, int)
*/
int update(float accum, int accumIdx, float x, int xIdx);
/** Do one accumulation update for a pair-wise (2 input) index accumulation
* @see #update(double, int, double, int)
*/
int update(double accum, int accumIdx, double x, double y, int idx);
/** @see #update(double, int, double, double, int) */
int update(float accum, int accumIdx, float x, float y, int idx);
/** Accumulation update for complex numbers.
* @see #update(double, int, double, int)
*/
int update(IComplexNumber accum, int accumIdx, IComplexNumber x, int xIdx);
/** Accumulation update for complex numbers.
* @see #update(double, int, double, int)
*/
int update(IComplexNumber accum, int accumIdx, double x, int idx);
/** Accumulation update for pairswise (2 input) complex numbers.
* @see #update(double, int, double, int)
*/
int update(IComplexNumber accum, int accumIdx, double x, double y, int idx);
/** Accumulation update for pairswise (2 input) complex numbers.
* @see #update(double, int, double, int)
*/
int update(IComplexNumber accum, int accumIdx, IComplexNumber x, IComplexNumber y, int idx);
/** Combine sub-results, when the index accumulation is split and executed in parallel.
* Often this is the same as the update operations (i.e., when finding index of maximum
* value for example), but sometimes not.
* Generally used internally by OpExecutors etc.
* @param first Value of one sub-accumulation (i.e., partial from one thread)
* @param idxFirst Index of the first value
* @param second Value of another sub-accumulation (i.e., partial accumulation from another thread)
* @param idxSecond Index of the second value
* @return Combined/accumulated index
*/
int combineSubResults(double first, int idxFirst, double second, int idxSecond);
/** @see #combineSubResults(double, int, double, int) */
int combineSubResults(float first, int idxFirst, float second, int idxSecond);
/** @see #combineSubResults(double, int, double, int) */
Pair combineSubResults(Pair first, Pair second);
/** Set the final index/result of the accumulation. */
void setFinalResult( int idx );
/** Get the final result of the IndexAccumulation */
int getFinalResult();
/**Initial value for the index accumulation
*@return the initial value
*/
double zeroDouble();
/** Initial value for the index accumulation.
* @return the initial value
* */
float zeroFloat();
/** The initial value and initial index to use
* for the accumulation
* @return
*/
Pair zeroPair();
/**Complex initial value
* @return the complex initial value
*/
IComplexNumber zeroComplex();
}
